As with all groups of people, there are good ones and bad ones... but my experience with them leads me to believe that there's a disproportionate number of bad ones (or "jackboots" as I like to call them).
The kind who behave like Eric Cartman ("respect my f**king authoritor"), lie about your civil rights (and trust me, they do lie), violate your freedoms (such as freedom to record them while they're victimizing you), treating victims like criminals, confiscating drugs from people to enjoy themselves (and I've witnessed that more times than I care to count). I've even been grabbed randomly in Bolton town centre (when I was unfortunate enough to live in the North-West) by two "officers" and illegally searched!
Sorry, but it's impossible to have any respect for a group so disproportionately abundant with assholes!